It's pretty interesting to see these molds.
These molds sold fairly quickly; but I haven't seen any casts for sale as of yet.

I've have tackled this craft it myself... I started making a 4.5 inch version just to see if I could get anywhere with it.
It's my intention to scale it up to about 12 inches if I could get the shape right.
This small version has ballooned up to 7.5 inches, but I think that I've almost nailed the shape and the larger details...
...but it took 6 months to do it. I had no sculpting experience.